Arbitral tribunal joinder of non-signatories depends on mutual intention and composite commercial transaction, not Section 11 formalities.

An arbitral tribunal may determine whether a non-signatory is bound by the arbitration agreement and, if so, join that party in the proceedings under its competence to rule on jurisdiction. The absence of a specific Section 11 determination or a separate Section 21 notice does not by itself bar such joinder, because referral-stage scrutiny is limited and Section 21 is directed mainly to commencement and limitation. Under the group of companies doctrine, joinder is justified where the facts show a composite commercial transaction, common management features, shared conduct, and a mutual intention to bind the non-signatory.

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Issues: (i) Whether an arbitral tribunal has the power to implead or join a non-signatory to the arbitration agreement in the arbitral proceedings; (ii) whether such impleadment is barred merely because the non-signatory was not specifically brought before the referral court under Section 11 or not served with a notice under Section 21; (iii) whether the non-signatory appellant was validly joined on the facts under the group of companies doctrine.

Issue (i): Whether an arbitral tribunal has the power to implead or join a non-signatory to the arbitration agreement in the arbitral proceedings.

Analysis: The statutory scheme of the Arbitration and Conciliation Act, 1996 does not prohibit an arbitral tribunal from deciding whether a non-signatory is bound by the arbitration agreement. The tribunal's jurisdiction flows from the arbitration agreement itself and its competence includes ruling on its own jurisdiction under Section 16. The question whether a non-signatory is bound by the agreement depends on a fact-intensive inquiry into mutual intention, conduct, relationship, subject matter, and composite nature of the transaction. Once the tribunal concludes that the non-signatory is bound by the agreement, impleadment follows as a necessary incident of that jurisdictional determination.

Conclusion: The arbitral tribunal does have the authority to implead or join a non-signatory, subject to the non-signatory being shown to be bound by the arbitration agreement.

Issue (ii): Whether such impleadment is barred merely because the non-signatory was not specifically brought before the referral court under Section 11 or not served with a notice under Section 21.

Analysis: The limited scrutiny at the referral stage under Section 11 is confined to the prima facie existence of an arbitration agreement and does not exhaust the tribunal's power to decide who is bound by it. The issue whether a non-signatory is a veritable party is distinct from the mere existence of the arbitration agreement and is better decided by the tribunal on evidence. Section 21 serves time-related purposes such as commencement and limitation; it does not operate as a jurisdictional bar to later joinder, and omission to issue such notice to a person does not by itself nullify the tribunal's jurisdiction over that person.

Conclusion: The absence of a specific Section 11 determination or a Section 21 notice does not by itself prevent impleadment of a non-signatory in arbitral proceedings.

Issue (iii): Whether the non-signatory appellant was validly joined on the facts under the group of companies doctrine.

Analysis: On the material placed, the entities functioned as a single economic and commercial unit, with common management features, shared branding, interconnected contracts, correspondence showing collective responsibility, and conduct indicating that the appellant participated in and backed the performance of the project. The cumulative facts supported an inference of mutual intention to bind the appellant to the arbitration agreement and justified its inclusion in the proceedings.

Conclusion: The appellant was validly impleaded as a party to the arbitration.

Final Conclusion: The appeal was found to lack merit, and the arbitral tribunal's jurisdiction to proceed against the non-signatory was upheld, leaving the merits of the underlying disputes to be decided in arbitration.

Ratio Decidendi: Where the factual matrix shows that a non-signatory had a positive, direct and substantial role in a composite commercial transaction evincing mutual intention to be bound, an arbitral tribunal may, under its jurisdiction to rule on its own competence, implead that non-signatory even if the referral court did not expressly decide joinder and no separate invocation was issued to it.

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